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Hi AllWe have an application where we need to exchange data between two PLC systems.One side is our side, S7-400 PLC, the other side is an adjacent plant using two CPU315-2DP's with ET200M's running on profibus redundancy ie. both PLC's linked to the same ET via IM153-2's.I did not know this was even possible with two seperate S7-300's. (see attachment)I had thought a DP/DP Coupler arrangement would be the solution, however can their two 300's do this?They would need a Y-Link module to join the two profibus's before going through to the DP Coupler?Is this possible, and if so, what Y-Link hardware modules are required on their side.Our other option is to simply put an ET station in and hardwire all the signal exchanges, but this is messy and outdated.Any thoughts?RegardsPhilip